Theoretical investigation of pulsed microwave discharge in nitrogen
Theoretical investigation of pulsed microwave discharge in nitrogen
复制标题
氮气中脉冲微波放电的理论研究
DOI：
10.1088/0963-0252/8/3/310
复制
发表时间：
1999
影响因子：
3.8
通讯作者：
J. Uhlenbusch
中科院分区：
文献类型：
--
作者：
M. Baeva;X. Luo;B. Pfelzer;J. Uhlenbusch
本文对低压（5 mbar）纯氮中圆柱形腔体（λ 2 = 2.45GHz）中心附近的脉冲微波放电燃烧进行了理论研究。玻尔兹曼方程分析适用于故障的描述和连续的维护阶段的放电。击穿电场估计使用计算的电离频率和自由电子扩散的损失。将氮分子电子基态振动能级N2（X，v）的速率主方程与电子的玻尔兹曼方程耦合，建立了电子和重粒子动力学的自洽模型。除了动量传递之外，玻尔兹曼方程还考虑了电子的非弹性和超弹性e-V碰撞、电离和自由扩散。振动能级的布居平衡包括e-V、V-V和V-T交换、离解、原子再结合、振动失活和分子扩散效应。使用的另一个关系是电子的整体能量平衡。计算的击穿电场强度和振动能级的人口的时间过程进行了比较与实验击穿数据和汽车测量。计算和测量结果吻合良好。
A pulsed microwave discharge burning close to the centre of a cylindrical chamber (/2 = 2.45 GHz) in pure nitrogen at low pressure (5 mbar) has been investigated theoretically. Boltzmann equation analysis is applied for the description of the breakdown and the consecutive maintenance phase of the discharge. The breakdown electric field is estimated using the calculated ionization frequency and the losses by the free electron diffusion. A self-consistent model for electron and heavy-particle kinetics coupling the rate master equations for the vibrational levels N2(X,v) of the electronic ground state of the nitrogen molecule to the Boltzmann equation of electrons has been developed. Besides the momentum transfer, inelastic as well as superelastic e-V collisions, ionization and free diffusion of electrons have been taken into account in the Boltzmann equation. The balance of the populations of the vibrational levels includes e-V, V-V and V-T exchanges, dissociation, atom re-association, vibrational deactivation on the walls and the effect of molecular diffusion. A further relation used is the global energy balance of electrons. The calculated breakdown electric field strength and the temporal course of the population of vibrational levels have been compared with experimental breakdown data and CARS measurements. Calculations and measurements are found to agree well.